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Research on stability of the accumulated rock-soil body of reservoir bank under rainfall condition

Science china(Technological Sciences) 2009年第9期52卷 2528-2535页

作者： gu chongshi1,2,wu haizhen1,2 & su huaizhi1,2 1 college of water resources and hydropower engineering,hohai university,nanjing 210098,china 2 National engineering Research Center of water resources Efficient Utilization and engineering Safety,hohai university,nanjing 210098,china 3 Jiangxi water Conservancy Research Institute,Nanchang 330029,china college of water resources and hydropower engineering Hohai University Nanjing China National engineering Research Center of water resources Efficient Utilization and engineering Safety Hohai University Nanjing China Jiangxi water Conservancy Research Institute Nanchang China

The shear strength parameters property of rock-soil aggregates in embankment slope of reservoir,that is,the relationship between cohesion and gravel content,between friction angle and gravel content,and the relationship between cohesion and water content,between friction angle and water content,is studied based on the direct shear test results,the shear strength change law of the rock-soil aggregates is given,and the unsaturated shear strength formulation of rock-soil aggregates that could consider suction and saturation degree influence is put forward in this paper,through which the sliding or failure physical mechanism of this type of slope under the condition of rainfall infiltration is studied. Also the 3D unsteady saturated-unsaturated seepage field and its FEM resolving mode are established based on the analysis of the slope rainfall infiltration process. Case study with this method indicates that the minimum safety factor of the accumulated rock-soil aggregates dose not arrive at the moment of rainfall cessation,but appears several hours after the rainfall cessation,this phenomenon is in accordance with the practical slope engineering's failure process and could explain appropriately the slope failure caused by rainfall infiltration. Research results in this paper have an important reference value for the research on stability of the accumulated rock-soil aggregates in embankment slope of reservoir,and can enrich the stability analysis method and relevant theory of reservoir embankment slope.

关键词： reservoir bank slope rock-soil aggregates rainfall infiltration saturated/unsaturated seepage

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Review on hidden trouble detection and health diagnosis of hydraulic concrete structures

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Science china(Technological Sciences) 2007年第Z1期50卷 34-50页

作者： wu ZhongRu1,2?, LI Ji1, gu chongshi1,2 & su huaizhi1,2 1 college of water Conservancy and hydropower engineering, hohai university, nanjing 210098, china 2 National engineering Research Center of water resources Efficient Utilization and engineering Safety, nanjing 210098, china college of water Conservancy and hydropower engineering Hohai University Nanjing China National engineering Research Center of water resources Efficient Utilization and engineering Safety Nanjing China

A large number of hydraulic concrete structures have hidden defects such as cracks, erosion, freeze and thaw, thermal fatigue, carbonization. These hidden defects seriously affect the strength, stability and durability of structures. These problems are studied mainly by single monitoring or diagnosis methods at present. The integration of multiple monitoring and diagnosis methods is not applied widely. Besides, the analysis theory on these problems is not developed very well. The systemic study on the aging mechanism of hydraulic concrete structures, time- variation model and health diagnosis is still not enough. The support for engineering practice is limited. Aimed at these major scientific and technological problems and combined with specific projects, study on detection of hidden defects and health diagnosis of hydraulic concrete structure has been carried out. This study includes the following content: field non-destructive examination of hidden defects of hydraulic concrete structures, seepage detection, the construction of in-situ sensing system, the combination of field detection and in-situ monitoring, the mechanism of crack, freeze and thaw, erosion and carbonization of hydraulic concrete structure, mechanism of combination aging; time-variation model of hydraulic concrete structure, theories and methods for health diagnosis of hydraulic concrete structures.

关键词： hydraulic concrete structure hidden trouble detection health diagnosis

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A new method of estimating the equivalent elastic modulus of RCCD

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Science china(Technological Sciences) 2007年第Z1期50卷 136-143页

作者： gu chongshi1,2?, wu Yuan1, su huaizhi1,2 & TANG LiHui1 1 college of water Conservancy and hydropower engineering, hohai university, nanjing 210098, china 2 National engineering Research Center of water resources Efficient Utilization and engineering Safety, nanjing 210098, china college of water Conservancy and hydropower engineering Hohai University Nanjing China National engineering Research Center of water resources Efficient Utilization and engineering Safety Nanjing China

Based on the composite material mechanic theory, the analysis method for the equivalent elastic moduli which are parallel and vertical to the construction interface of RCCD is studied in this paper. The differences between the equivalent elastic moduli which are vertical to the construction interface of RCCD gotten from different methods are discussed in detail. The variation range of the equivalent elastic modulus which is vertical to the construction interface of RCCD is studied based on the principle of minimum complementary energy and the principle of minimum potential energy. The effect of the related influential factors on the equivalent elastic modulus is analyzed. The estimation formula of the equivalent modulus which is vertical to the construction interface of RCCD is proposed. The feasibility of the approach proposed in this paper is analyzed through an example.

关键词： RCCD equivalent elastic modulus variation range estimation method

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Game model of safety monitoring for arch dam deformation

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Science china(Technological Sciences) 2008年第S2期51卷 76-81页

作者： su huaizhi1,2,wu ZhongRu1,2,gu YanChang1,2,HU Jiang1 & WEN ZhiPing3 1 college of water Conservancy and hydropower engineering,hohai university,nanjing 210098,china 2 National engineering Research Center of water resources Efficient Utilization and engineering Safety,nanjing 210098,china 3 Department of Computer engineering,nanjing Institute of Technology,nanjing 210013,china college of water Conservancy and hydropower engineering Hohai University Nanjing China National engineering Research Center of water resources Efficient Utilization and engineering Safety Nanjing China Department of Computer engineering Nanjing Institute of Technology Nanjing China

Arch dam deformation is comprehensively affected by water pressure,temperature,dam's structural behavior and material properties as well as other *** them the water pressure and temperature are external factors(source factors) that cause dam deformation,and dam's structural behavior and material properties are the internal factors of deformation(resistance factors).The dam deformation is the result of the mutual game playing between source factors and resistance ***,resistance factors of structure and materials that reflect resistance character of arch dam structure are introduced into the traditional model,where structure factor is embodied by the flexibility coefficient of dam body and the maximum dam height,and material property is embodied by the elastic modulus of *** the basis of analyzing the correlation between dam deformation and resistance factors,the game model of safety monitoring for arch dam deformation is put forward.

关键词： arch dam deformation monitoring model flexibility coefficient game theory

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Risk analysis model for landslide mass of high slope in dam area

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Science china(Technological Sciences) 2008年第S2期51卷 25-31页

作者： gu chongshi1,2,HE XianFeng3,4,wu ZhongRu1,2 & su huaizhi1,2 1 college of water Conservancy and hydropower engineering,hohai university,nanjing 210098,china 2 National engineering Research Center of water resources Efficient Utilization and engineering Safety,nanjing 210098,china 3 Yellow River Institute of Hydraulic Research,Zhengzhou 450003,china 4 Embankment Security Defect Prevention and Control engineering Research Center of MWR,Zhengzhou 450003,china college of water Conservancy and hydropower engineering Hohai University Nanjing China National engineering Research Center of water resources Efficient Utilization and engineering Safety Nanjing China Yellow River Institute of Hydraulic Research Zhengzhou China Embankment Security Defect Prevention and Control engineering Research Center of MWR Zhengzhou China

In order to identify the threat of reservoir bank landslide to dam safety and reduce the risk of dam failure,impact factors of the landslide are *** concept of landslide risk degree is put forward to measure the threat of landslide to dam *** monotony of the landslide risk assessment function which changes with different affecting factors is analyzed *** on gene automatic programming,a data mining model of the landslide risk assessment function is constructed combined with impact factors of reservoir bank landslide on dam *** the assessment function of landslide risk has been excavated and established according to practical project information,which provides a valuable reference for analyzing the impact of landslide on dam risk.

关键词： landslide dam failure risk landslide risk

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Dam risk assistant analysis system design

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Science china(Technological Sciences) 2008年第S2期51卷 101-109页

作者： HE XianFeng1,2,3,gu chongshi3,4,wu ZhongRu3,4 & su huaizhi3,4 1 Yellow River Institute of Hydraulic Research,Zhengzhou 450003,china 2 Embankment Security Defect Prevention and Control engineering Research Center of MWR,Zhengzhou 45000,china 3 college of water resources and hydropower engineering,hohai university,nanjing 210098,china 4 National engineering Research Center of water resources Efficient Utilization and engineering Safety,hohai university,nanjing 210098,china Yellow River Institute of Hydraulic Research Zhengzhou China Embankment Security Defect Prevention and Control engineering Research Center of MWR Zhengzhou China college of water resources and hydropower engineering Hohai University Nanjing China National engineering Research Center of water resources Efficient Utilization and engineering Safety Hohai University Nanjing China

In order to reduce the labor intensity and task difficulty of dam risk analysis and to meet the actual requirement of dam risk analysis,it is necessary to establish a dam risk assistant analysis *** program structure and the implementation ways of the dam risk assistant analysis system are analyzed,and a procedural framework with "three-tier and multi-database" structure and "level structure" is *** concept of dam risk assessment system modular development is proposed and the coupled mode of function module and data is ***,the dam risk assistant analysis system is developed using Delphi visual programming language.

关键词： dam risk risk analysis assistant analysis system

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库岸边坡变形的统计-混沌混合预测模型

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水电能源科学 2008年第3期26卷 129-132页

作者：宋敬衖吴海真顾冲时河海大学水利水电工程学院江苏南京210098

基于降雨作用下边坡非饱和土的滑移理论及岩土体蠕变效应的量化研究,构建了库岸边坡改进的多因素监控模型。在此基础上将边坡位移表示为由确定性分量、混沌分量和随机分量叠加而成,并以多因素监控模型对确定性成分建模,对残差序列进行... 详细信息

基于降雨作用下边坡非饱和土的滑移理论及岩土体蠕变效应的量化研究,构建了库岸边坡改进的多因素监控模型。在此基础上将边坡位移表示为由确定性分量、混沌分量和随机分量叠加而成,并以多因素监控模型对确定性成分建模,对残差序列进行相空间重构,建立了统计—混沌混合预测模型。实际应用表明,与传统的统计模型相比,该模型可明显提高回归和预测精度,具有一定的实用价值和推广价值。

关键词：库岸边坡变形改进的多因素监控模型统计-混沌混合预测模型

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